Samsung Galaxy S25 Ultra vs Samsung Galaxy S24 Ultra: SAR comparison

Both list the same head sar, cellular only (us): 1.26 W/kg. Reported SAR values in W/kg; lower is shaded green and higher red within each row, for comparison only.

Open in interactive SAR Compare Samsung Galaxy S25 Ultra details Samsung Galaxy S24 Ultra details

Side-by-side SAR values

Samsung Galaxy S25 Ultra vs Samsung Galaxy S24 Ultra reported SAR and specs
Measurement	Samsung Galaxy S25 Ultra	Samsung Galaxy S24 Ultra
Head SAR, cellular only (US)	1.26 W/kg	1.26 W/kg
Body SAR, cellular only (US)	0.78 W/kg	0.62 W/kg
Head SAR, Wi-Fi + cellular (US)	1.59 W/kg	1.59 W/kg
Body SAR, Wi-Fi + cellular (US)	1.40 W/kg	1.52 W/kg
Hotspot SAR, cellular only (US)	1.19 W/kg	1.26 W/kg
Hotspot SAR, Wi-Fi + cellular (US)	1.48 W/kg	1.45 W/kg
Display: Type	Dynamic LTPO AMOLED 2X, 120Hz, HDR10+, 2600 nits (peak)	Dynamic LTPO AMOLED 2X, 120Hz, HDR10+, 2600 nits (peak)
Display: Size	6.9 inches (full rectangle); 6.8 inches accounting for rounded corners	6.8 inches, 113.5 cm2 (~88.5% screen-to-body ratio)
Display: Resolution	1440 x 3120 pixels, 19.5:9 ratio (~505 ppi density)	1440 x 3120 pixels, 19.5:9 ratio (~505 ppi density)
Display: Protection	Corning Gorilla Armor 2	Corning Gorilla Armor
Hardware: Operating System	Android 15, up to 7 major Android upgrades, One UI 7	Android 14, One UI 6.1.1
Hardware: Chipset	Snapdragon 8 Elite for Galaxy	Qualcomm SM8650-AC Snapdragon 8 Gen 3 (4 nm)
Hardware: CPU	Octa-core (2x4.19 GHz & 6x2.90 GHz)	8-core (1x3.39GHz Cortex-X4 & 3x3.1GHz Cortex-A720 & 2x2.9GHz Cortex-A720 & 2x2.2GHz Cortex-A520)
Hardware: GPU	Adreno 830 (1.25 GHz)	Adreno 750 (1 GHz)
Battery: Type	Li-Ion 5000 mAh, non-removable	Li-Ion 5000 mAh, non-removable
Battery: Charging	45W wired, PD3.0, 65% in 30 min (advertised) 25W wireless (Qi2/PMA) 4.5W reverse wireless	45W wired, PD3.0, 65% in 30 min (advertised) 15W wireless (Qi/PMA) 4.5W reverse wireless
Design: Type	Bar	Bar
Design: Dimensions	162.8 x 77.6 x 8.2 mm (6.41 x 3.06 x 0.32 in)	162.3 x 79 x 8.6 mm (6.39 x 3.11 x 0.34 in)
Design: Weight	218 g	232 g or 233 g (8.18 oz)
Design: Colors	Titanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray; additional colors may vary by market	Titanium Black, Titanium Gray, Titanium Violet, Titanium Yellow, Titanium Blue, Titanium Green, Titanium Orange

Colors make differences within the same measurement easy to see. They do not label a phone safe or unsafe. US values use 1 g of tissue and the 1.6 W/kg limit; EU values use 10 g and 2 W/kg, so don't mix them. What SAR tells you.

Questions and answers

Which has lower head SAR, the Samsung Galaxy S25 Ultra or the Samsung Galaxy S24 Ultra?

Both list the same head sar, cellular only (us): 1.26 W/kg. Values are reported maximums from FCC filings as listed in the RF Safe dataset, in W/kg averaged over 1 gram of tissue.

Which has lower body SAR, the Samsung Galaxy S25 Ultra or the Samsung Galaxy S24 Ultra?

The Samsung Galaxy S24 Ultra lists the lower body sar, cellular only (us): 0.62 W/kg vs 0.78 W/kg for the Samsung Galaxy S25 Ultra (21% lower). Values are reported maximums from FCC filings as listed in the RF Safe dataset, in W/kg averaged over 1 gram of tissue.

Which has lower hotspot SAR (Wi-Fi + cellular), the Samsung Galaxy S25 Ultra or the Samsung Galaxy S24 Ultra?

The Samsung Galaxy S24 Ultra lists the lower hotspot sar, wi-fi + cellular (us): 1.45 W/kg vs 1.48 W/kg for the Samsung Galaxy S25 Ultra (2% lower). Values are reported maximums from FCC filings as listed in the RF Safe dataset, in W/kg averaged over 1 gram of tissue.

What is the highest reported SAR value for each phone?

Across the six US measurements, the Samsung Galaxy S25 Ultra's highest listed value is 1.59 W/kg and the Samsung Galaxy S24 Ultra's is 1.59 W/kg. The FCC limit for the head and body is 1.6 W/kg averaged over 1 gram. Wi-Fi + cellular values are simultaneous-transmission sums and are evaluated differently, so read each row on its own.

Does a lower SAR mean a phone is safer?

No. SAR is a lab compliance measurement taken at maximum power. Everyday exposure depends on signal strength, distance from the body and which radios are active. Use SAR to compare phones, not as a health score.

Where do these numbers come from?

From the RF Safe SAR dataset, compiled from FCC equipment authorization filings (FCC ID A3LSMS938B and A3LSMS928U). Nothing on this page is estimated.

More comparisons

All phone-vs-phone pages · SAR rankings · Research library

Compare any two phones

First phoneSecond phone

Opens a ready-made comparison page when there is one, otherwise the interactive SAR Compare app.